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Free CSV Duplicate Remover Online

Instantly remove duplicate CSV rows by full row or selected columns securely in your browser with our free CSV duplicate remover.

Remove CSV duplicates

Duplicate settings

Mode

Deduplicated CSV

Clean output will appear here after you run Remove Duplicates.

Clean CSV output will appear here.

What Is a CSV Duplicate Remover?

A CSV duplicate remover is a free online data tool designed to help developers and data analysts dedupe spreadsheet rows instantly. Instead of using complex spreadsheet formulas, this tool cleans your raw data directly in your web browser. By simply pasting your text or uploading a file, you can effortlessly remove duplicate CSV rows based on exact full-row matches or specific targeted columns. Because it processes everything locally on your device, this browser-based tool provides a fast, privacy-friendly way to clean your datasets without ever uploading sensitive files to external servers.

How It Works

How to Use the CSV Duplicate Remover

  1. Add the CSV

    Upload your .csv file or paste the source rows directly into the input area.

  2. Choose match rules

    Select full-row matching or specify exact columns to accurately find duplicates.

  3. Preview and export

    Check your final cleanup summary, then copy or download the deduplicated CSV result.

Features

Built for safe duplicate cleanup

  • Row or column matching

    Intelligently check and remove duplicates by matching the entire full row or only targeting selected specific fields.

  • Cleanup summary

    Instantly view a transparent breakdown showing your original, removed, and kept row counts before you export.

  • Browser-side processing

    Your files stay securely on your device, and large CSV datasets are handled safely without any server uploads.

  • Quick final export

    Download your cleaned spreadsheet file or copy the deduplicated CSV result directly to your clipboard in one click.

Frequently Asked Questions

Quick answers to common questions about using this tool.

Is my CSV uploaded to PotatoTools? +

No. CSV duplicate removal runs in your browser, so files are not uploaded to our server.

Can I remove duplicates by only one column? +

Yes. Switch to selected columns mode and choose the column or columns that should define a duplicate.

Can I keep the last matching row instead of the first? +

Yes. Use the keep selector to keep either the first or last matching row.

Do I need an account to dedupe my CSV? +

No signup or registration is required. You can use this free online tool to clean and dedupe as many CSV files as you need.

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